The RAS Audio Amplifier is the standalone unit that receives audio signals from AUX IN, Bluetooth and 0dB LINE IN. The AUX IN and Bluetooth INPUT are switchable. The LINE IN has the highest priority with dry contact trigger function. The audio signal will be amplified by 2 x 30W low impedance Class-D amplifier. The selected AUX In and Bluetooth will have a gain control on the front panel. Besides, the unit will receive an external dry-contact to mute the audio output.